/Engine/Plugins/Runtime/nDisplay/Source/DisplayClusterScenePreview/Public/IDisplayClusterScenePreview.h
Get a list of all actors that have been added to a renderer's scene. This includes any actors that the renderer automatically added to itself.
bool GetActorsInRendererScene ( int32 RendererId, bool bIncludeRoot, [TArray](API\Runtime\Core\Containers\TArray)< [AActor](API\Runtime\Engine\GameFramework\AActor) * > & OutActors )